c语言rs232 串口通信（C简单串口通信232）

简单的界面

波特率 校验位 停止位 数据位 及串口号 使用ComboBox控件，并更改它们的NAME属性：

baudrateCbx；

parityCbx；

stopBitsCbx；

dataBitsCbx；

portscbx；

检查串口 打开串口 发送 接收 为Button控件，更改NAME属性：

checkbtn；

Openbtn;

sentbtn;

receivedbtn;

代码部分：

using System.IO.Ports;//引用

SerialPort sp1 = new SerialPort();//实例化

检查串口：

private void checkbtn_Click(object sender, EventArgs e)

{

string[] strCom = SerialPort.GetPortNames();

if (strCom == null)

{

MessageBox.Show("本机没有串口！", "Error");

return;

}

foreach (string comExist in strCom)

{

portscbx.Items.Add(comExist);

portscbx.SelectedIndex = 0;

}

}

打开串口：

private void button1_Click(object sender, EventArgs e)

{

sp1.Open();

openbtn.Text = "关闭串口";

portscbx.Enabled = false;

baudrateCbx.Enabled = false;

parityCbx.Enabled = false;

stopBitsCbx.Enabled = false;

dataBitsCbx.Enabled = false;

myopen = true;

}

波特率：

private void botelucbx_SelectedIndexChanged(object sender, EventArgs e)

{

sp1.BaudRate = Convert.ToInt16(baudrateCbx.Text.Trim());

}

校验位：

private void jiaoyancbx_SelectedIndexChanged(object sender, EventArgs e)

{

string sjjy = parityCbx.Text.Trim();

switch (sjjy)

{

case "无":

sp1.Parity = Parity.None;

break;

case "奇校验":

sp1.Parity = Parity.Odd;

break;

case "偶校验":

sp1.Parity = Parity.Even;

break;

default:

sp1.Parity = Parity.None;

break;

}

}

停止位：

private void tingzhicbx_SelectedIndexChanged(object sender, EventArgs e)

{

int f = (int)Convert.ToSingle(stopBitsCbx.Text.Trim()) * 10;

switch (f)

{

case 0:

sp1.StopBits = StopBits.None;

break;

case 10:

sp1.StopBits = StopBits.One;

break;

case 15:

sp1.StopBits = StopBits.OnePointFive;

break;

case 20:

sp1.StopBits = StopBits.Two;

break;

default:

sp1.StopBits = StopBits.None;

break;

}

}

数据位：

private void shujucbx_SelectedIndexChanged(object sender, EventArgs e)

{

sp1.DataBits = Convert.ToInt16(dataBitsCbx.Text.Trim());

}

串口号：

private void comboBox5_SelectedIndexChanged(object sender, EventArgs e)

{

sp1.PortName = portscbx.Text.Trim();

}

发送：

private void sentbtn_Click(object sender, EventArgs e)

{

System.Text.UTF8Encoding utf8 = new System.Text.UTF8Encoding();

byte[] writeBytes = utf8.GetBytes(textBox1.Text);

sp1.Write(writeBytes, 0, writeBytes.Length);

}

接收：

private void received_Click(object sender, EventArgs e)

{

System.Threading.Thread.Sleep(100);

System.Text.UTF8Encoding uft8 = new System.Text.UTF8Encoding();

byte[] readByres = new byte[sp1.BytesToRead];

sp1.Read(readByres, 0, readByres.Length);

string recevid = uft8.GetString(readByres);

textBox2.Text = recevid;

}

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